The aperture setting on a camera determines how open the lens is when taking a photograph. A larger aperture (smaller f-stop number like f/2.8) allows more light in but decreases depth of field, making the background more out of focus. A smaller aperture (larger f-stop number like f/22) allows less light in but increases depth of field, making both the subject and background in focus. The document provides examples of how different aperture settings impact portraits and landscapes, then further explains the relationship between aperture, depth of field, and light levels.
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3. Every time you take a photograph, the
lens of your camera opens to let in
light.
The APERTURE setting determines
how much or how little your lens
opens when you take a photograph.
The bigger the aperture (f/22)the less
light
The smaller the aperture the more
light(f/2.8)
What is Aperture?
4. Depth of field and Aperture
Aperture has a big impact on depth of field.
Large apertures (smaller f/stops) will decrease the depth of field:making the
background out of focus
Small apertures (higher apertures) will increase your depth of field:making the
subject and the background be in crisp focus.
5. Why Aperture Really Matters…
When your lens is open very wide, the background is
typically out of focus.
• Wide-open aperture is good for portrait
photographs, when you don't want the
background to interfere with your subject.
When your lens is only open a small amount, everything
from the foreground to the background is in focus.
• Slightly-open aperture is used for landscape
photographs, so that all of the scenery in the
photo is in focus.
33. The Aperture / Depth of Field
Relationship
When you focus your camera on an object in
space, you are also focusing on everything else
around the object that is the same distance
away from the camera.
This can also be described as focusing on a
PLANE, rather than a point.The following
illustrations will introduce you to two important
concepts: plane of focus and depth of field.
34. f4.5 (wide open) = LARGE AMOUNT OF
LIGHT
f8.0 (somewhat open) = MEDIUM
AMOUNT OF LIGHT
f22 (almost closed) = SMALL AMOUNT OF
LIGHT
(Relationship between aperture and actual light)
FSTOP TRANSLATION
35. What is Aperture priority?
Many digital cameras can be set to
aperture priority mode. “A”
In this mode, you set the aperture and
the camera automatically selects the
shutter speed so that the photograph
has the right exposure.